Asociologist found that in a random sample of 50 retired men, the average number of jobs they had during their lifetimes was 7.2. the population standard deviation is 2.1
find the 99% confidence interval of the mean number of jobs. do not round the z value, it should have two decimal places, example 2.34. round the interval to one decimal place, example 3.2 < μ < 5.6

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< coa = 150 ( given)

as ba and bc are tangents

so oc and oa is perpendicular to cb and ab respectively because in circle normal passes through centre

so in quadrilateral oabc

< coa + < oab + < ocb + < abc = 360

150 +90+90 + < abc = 360

330 + < abc = 360

< abc = 360 -330 = 30

so < abc = 30

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(-1,-0.5)

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